Electrical precipitator



March 1954 w. E. KElST ELECTRICAL PRECIPITATOR Filed July 7, 1950 .23 v INVENTOR; W154 ouan,/ x%w I 1 L... J

Patented Mar. 16, 1954 Y UNITED STATES TENT OFFICE 2,672,206 ELECTRICAL PRECIPITATOR Walter E. Keist, Pittsburgh, Pa., assignor to The Dualtron Company, Pittsburgh, Pa., a partnership Application July 7, 1950, Serial No. 172,517 3 Claims. (Cl. l837) 1 This invention relates to electrical precipitaany large particles of dirt that may not be tors, and more particularly to the arrangement of deposited on the collector plates and also to the different elements therein. collect any moisture that may splash out the Electrical precipitators for removing dust from pan. air pa s ng throu h them are used both alone 5 The preferred embodiment of the invention is and in combination with heating units. It is illustrated in the accompanying drawings, in

space may be rather restricted. Heretofore, preoutlet side of the cabinet with part of the side cipitators have required considerable floor space wall broken away; and Fig. 3 is a horizontal because the air blowers that circulate air through section taken on the line III-III of Fig. 1. them have bee located at the sides of the units. Referring to the drawings, an upright rectan- It is among the objects of this invention to gular cabinet i has an air inlet 2 in its top and provide an electrical precipitator which is very an air outlet 3 in one side near its bottom. Di-

outlet in its bottom in a side wall. Preferably, through a suitable valve (not shown) to a supply the upper part of the cabinet and includes the charged dust particles are deposited as the air usual dust collector plates. For washing precarries them downward between the plates.

cipitated dust from the plates, 2. water sprayer After the precipitator has been operating for is disposed above them. The wash water leavawhile it becomes necessary to wash the precipiing the p e s Caught in a dram D n d re ly tated dust from the ionizer and collector plates. below the plates. This pan has an inclined This is done by means of the water sprayer above lower wall extending across it, with a drain pipe them. In order to collect the dirty water flowing inclined wall is provided with air passages is mounted in the cabinet directly beneath the through it, but the wash water is prevented from plates. A pair of opposite upper edges of this going through the passages by means of overpan may have lateral flanges i2 which are su iapping water deflecting members above them. ported by ledges I 3 attached to the inside of the The water flows down over these deflecting memcabinet, so that the pan can be slipped in and hers to the drain pipe. Because the air passages out of the cabinet by sliding the flanges on the can be located in the bottom of the drain pan, ledges.

an air blower can be mountedbeneath the pan It is a feature of this invention that the major pan and the side of the cabinet which isadjapoint spaced a short distance from the oppocent the upper end of that wall. The air blower site side of the drain pan. Between that side and preferably projects a material distance up into the lower end of the inclined wall the drain pan the tapered space so that locating the blower in extends downward a short distance to form a the bottom of the cabinet will not increase the sump Hi, from the bottom of which a drain pipe height of the cabinet an objectionable amount. it extends out through the adjacent side of the The blower draws air into the inlet at the top cabinet. With sufiicient inclination, the inclined of the cabinet and delivers it to the outlet near wall can be provided with openings for passage the bottom. an electric motor is mounted in of air therethrough without any danger of the the bottom of the cabinet beneath the lowest part water in the pan flowing through such openings. of the drain for driving the blower. It is desir- The advantages of this are two fold. By placing able to mount an air filter against the lower side 5 of the perforated wall of the drain pan to catch instead of in a side Wall, the air blower ll can 2,672,206 be located below the drain pan instead of at the for washin precipitated dust from them when side of it. Therefore, the cabinet need be subdesired, a drain pan in the cabinet below the stantially no larger in horizontal section than plates for receiving wash water therefrom and necessary to accommodate the drain pan. On having an inclined lower wall extending across the other hand, if the blower were located below it to form an upwardly tapered space between the pan but the air passages were in a side wall of that wall and the side of the cabinet that is adthe pan, the cabinet would have to be materially jacent the upper end of the inclined wall, a drain larger than the an to provide enough space bepipe connected to the pan at the lower end of tween the pan and cabinet for an adequate flow said wall, the inclined wall being provided with of air down to the blower. The other advantage 10 air passages th r hrou h b w n v r ppin of inclining the lower wall of the drain pan mawater deflectin members that chhduct the Wash terially is that it leaves an upwardly tapered water to the drain pipe, and an air blower mountor triangular space between that wall and the ed n y Within the Cabinet heheath the hside of the cabinet facing it. A considerable por- Clined W Of the drain p and h a mammal tion of this space can be occupied by the blower, portion of the blower disposed in said ape so the cabinet does not have to be made as tall p the blower being pt to a H1110 as would be the case if the blower were comsaid inlet anddelivel it to said outlet. pletely below the lowest point of the pan. Prer- An ec c precipitator comprisin an r perably, the lower wall of the pan is inclined at right eehmeh Feetehghlar horlzehtal e l an angle of about 45 degrees. with parallel sides, the cabinet having an air in- The inclined lower Wall of the drain pan is let M s p en a r outlet near its bottom, conveniently formed from arectangular frame it an eleeh'leel preelpltehen h' mohnted m the made of an le ba across which 1ouVe1-s extend upper part of the cabinet and including dust col- Each louver i m t strip 9 t has a Slightly lector plates having a vertical air passage betwe en inclined body ith d t fla at its them, a water sprayer disposed above said plates lower edge and an upwardly inclined flange along for Washing precipitated dust from them when its upper edge, as shown in Fig. 2. The upper desired, a drain pan in the cabinet below the flange lies fl t t, t upper urfac of the plates for receiving wash water therefrom and opposite sides of the frame and is attached to having a lower wall inclined downwardly across the h ends of t strip engage the upright it from one side to a sump at the bottom of the flanges of the frame and may be attached to them ophoslte elder e dram plpe connected to the Sump if desired. The strips are so arranged that, th

the inclined wall being provided with air passages overlap one another in vertically spaced relation therethrough between overlapping water deflectso that water flowing over the lower edge of each mg members that eohduet the W Water to the strip will fall on the strip below it. In this way Sump, an blower mounted 1n the Cablhei the strips or louvers form waterfalls down the health mchhetl well Of the drain pan and inclined wall to the sump M. The spaces or slots edephed to drew Sela lhlet and dehver h 20 between the louvers form passages for air beto Send e the blower extending up h e 3? m drawn down through the cabinet by the sump and. into the space between said inclined blower, which is connected with air outlet 3. Well and the side of the eeblheti e m beneath The collector plates are washed only when the the sump and meehs enmely m the cehmet mower is not operating, so there is no danger of operatively connectingthe motor with the blower. the blower sucking the wash water through the An e1 ectnce1'prec1p1tat r compn'sme an h drain pan slots between the louvers. However, a night cabmet ,rectangular honzfmtal e little Water may Splash through the Slots To with parallel sides, the cabinet having an air inprevent such water from reaching the blower, a let at mete? hh l Outlet near its bottom, dry filter 22, such as a spun glass filter commonly an electncal preclplthtlon mohnted m the used in air conditioning units, is held against the upper part of e cabinet and {ndudmg dust lower side of frame 3 by means of parallel lector plates having a vertical all passage between them a water sprayer disposed above said plates 1- W flanges 23 attached to the frame. This filter 00. for ashmg precipitated dust fro them hen lects any drops of water that pass through the the cabinet below the z having an inclined lower wall extending across also Serves to h any ge partcles of dust it a drain pipe connected to the pan at the lower that are not deposited upon the collector plates. on end of said wall the inclined wan being provided g: gf f a gi i g l gggf f $33; with air passages therethrough between overlapdrives the blower y means of a belt 25 ping water deflecting members that conduct the L wash water to the dram pipe, an air filter mount- Accordmg to the the i ed against the lower side of said inclined wall, Stathtes I have exhlamed the phnclplepf G0 and an air blower mounted entirely within the l Ventmn have mustmted and descnbed, cabinet beneath the inclined wall of the drain I now consider to represent lts best embodiment. pan and wanted to draw air into said inlet and However, I desire to have it understood that, deliver it to a outlet within the scope of the appended claims, the in- WALTER E KEIST vention may be practiced otherwise than as speciizilcallly illustrated and described. References Cited in the file of this patent c aim:

1. An electrical precipitator comprising an up- UNITED STATES PATENTS right cabinet rectangular in horizontal section Number Name Date with parallel sides, the cabinet having an air in- 2986.3 Manning et a1 ly 193'? let at its top and an air outlet near it bottom, ,5 tad Sept. 20, 933 an electrical precipitation unit mounted in the 2,181,147 Pegg Nov. 28, 1939 upper part of the cabinet and including dust (301- 2,181,767 Penney Nov. 28, 1939 lector plates having a vertical air passage between 2,476,243 MaCKBnZiB y 12, 1949 them, a water sprayer disposed above said plates 75 2,579,552 Cumm ngs Dec. 25. 1 1 

